Van Gaal was critical of the pitch at Cambridge's home ground following the stalemate and highlighted the performance of Foy.

"Every aspect of a match is against us," van Gaal said post-match.

"We have to come here, the pitch isn't so good, that can influence that you can play in another style. The opponents always give a lot more than they normally give and defending is always easier than attacking.

"Then you have seen the referee – it's always the same. Everywhere I have coached these games, and I have coached them with other clubs, it's always the same."

Van Gaal's side progressed into the fifth round of the FA Cup after beating Cambridge 3-0 in Tuesday's replay at Old Trafford.